心软是病而你是命
[xīn ruăn shì bìng ér nĭ shì mìng]
'心软是病而你是命' means 'Being softhearted is a disease, but you are my destiny.' Here the user may be confessing that even if they consider their softheartedness a weakness, loving this particular person (or being loved by them) feels essential to their survival, thus elevating the target of their affection to a level equal with life or death.